Gas burner



June 14, 1932. T. A. COLEMAN GAS BURNER Filed Sept. 21, 1931 PatentedJune 14, 1932 PATENT OFFICE THOMAS A. COLEMAN, OF CARBONDALE,PENNSYLVANIA GAS BURNER Application filed September .3

This invention aims to provide a burner for gas, so constructed thatefficient combustion will result, either when the supply of gas isample, or when the supply is limited. An-

other object of the invention is to provide a device'of the classdescribed, in which an efficient combustible mixture of gas and air willbe produced, with the expenditure of a minimum amount of gas, through awide range of pressure. This invention aims, further, to provide adevice of the class described having a gas chamber of such size as toprovide a sufficient supply of gas in the event of a sudden drop orlowering of pressure, it being'possible to have the gas supplied in awide variety of range, and so to construct the device that a pluralityof the structures shown may be grouped in any desiredway, depending uponthe taste of the heating engineer.

' tion and arrangement of parts and in the details of constructionhereinafter described 9 and claimed, it being understood that changes inthe precise embodiment of the invention herein disclosed, may be madewithin the scope of what is claimed, without departing from the spiritof the invention.

In the accompanying drawing Figure 1 shows in vertical longitudinalsection, a device constructed in accordance with the invention, partsbeing in elevation;

Figure 2 is an end elevation;

Figure 3 is a top plan of one of the burner tubes and its cap.

In carrying out the invention, there is provided a casing, including anelongated hollow body 1, the interior of which forms a gas chamber 2,the body being cylindrical in cross section, as indicated at 3 in Figure2, although the body may be of any desired cross section. The body 1includes end walls 4 which are extended above the body 1, to form lugs5. On its sides and on its ends, the body 1, 1931. Serial No. 564,224.

1 has openings 6, so that the fuel supply pipe 8., which handles thegas, may be located as desired. The openings 6 which are not occupied bythe fuel supply pipe 8 are stopped by closure 7, which may be screwplugs.

Nozzles 9 are threaded or mounted otherwise in the top of the body 1,and have reduced vertical bores 10. Above the body 1 is located a flathorizontal table 11, which is considerably wider than the body 1, asshown in Figure 2. The ends of the table 11 are attached by securingelements 12 to the upper ends of the lugs a. The space 14 between thetable 11 and the top of the body 1 is open, thereby forming an air inletwhich extends entirely across the casing from side to side.

Mixing tubes 15 are located immediately above the nozzles 9. A means isprovided for mounting the mixing tubes 15 for vertical adjustment,toward and away from the nozzles 9, and with this end in view, the lowerends of the mixing tubes are threaded at 16 into the table 11. The lowerportions of the bores of the mixing tubes 15 may be cylindrical, asshown at 17, although, throughout practically the entire length of themixing tubes 15, the bores flare, as they extend upwardly, as shown at18.

Conical caps 19 are seated in the upper ends of the mixing tubes 15. Thecaps 19 30 have central longitudinal passages 20, and the caps areprovided on their outer surfaces with longitudinal grooves 22, locatedimmediately adjacent to each other, and increasing in width from theirlower ends to their 85 upper ends. On their upper surfaces, the caps 19may be provided with upstanding nippics 21, disposed about the passage20.

In practical operation, the gas enters through the pipe 8, into thechamber 2. This 90 chamber 2 is of suilicient size so that it will holda large quantity of gas, and make up for any irregularities (withinreasonable limits) which may occur in the pressure of the gas supply.The gas passes at high speed as through the reduced bores 10 of thenozzles 9. The air enters the sides of the casing,

through the space 1 1, and mixes with the gas,

as the gas passes into the mixing tubes 15, where a thorough mixture ofgas and air is brought about. A regulation in the amount of airsupplied, relative to the amount of gas supplied, may be brought aboutby threading the tubes 15 upwardly and downwardly, at 16, in the table11, the space between the lower end of the tubes 15 and the nozzles 9thus being adjusted. Because the tubes 15 have the flaredbores 18, themixture expands as it moves upwardly, but the mixture moves upwardlywith great rapidity, toward the caps 19. A part-of the mixture goes upwardly through the central passages 20, andburns at the upper end of thepassages 20, that is, at the nipple 21, in the form of a jet. A part ofthe gas or mixture moves upwardly through the longitudinal grooves22 ofthe caps 19, and the gas expands laterally, owing to the fact that thegrooves 22 widen as they extend upwardly. There is formed, therefore,around the jet burning at the nipple 20, an annulus of flame, at theupper ends of the grooves 22. It is clear that air can find its waybetween this annulus of flame and the central jet at the nipple 21.Ample air,

I this application is intended primarily for use in connection withboilers and furnaces, and

therefore,is supplied to the jet burning at the nipple 21, and theannulus of flame has air both inside of it and outside of it, therebypromoting combustion, and keeping down carbon.

The device forming the subject matter of y it is characterized bysimplicity of construction, the number of parts being out down, andeconomy 1n the consumption of gas being brought about, regardless ofwhether the de- .vice is used with natural gas, or with manufacturedgas, under all pressures. The device provides an efficient combustion ofgaswhen burning with a full supply of gas or when the supply of gas islimited. It provides an eflicient'combustible mixture of gas and air, byusing a minimum amount of gas with a maximum amount of air, through awide range of pressure. the gas chamber 2 is of large size, and aflordsa supply ofg'asin the event of a sudden lowering of gas pressure. Theconnections for the pipe 8 maybe made in a number of different' placesowing to the provision of-a plurality of the openings 6. The tubes 15may be adjusted vertically with respect to the'nozzles 9, and the devicemay be used either with natural gas or with manufactured gas, a singleadjustment, generally, being necessary, and that adjustment being madewhen the device is installed. The large chamber at 2 provides for anyfluctuations .which may thereafteroccur.

- What is claimed is 1. A device of the class described, comprising anelongated hollow body having a fuel inlet, the body comprising end wallsthat exi tend above the body, nozzle's inthe top of the b y, a le un eon he upp r s o It is to be observed that the end walls and spaced fromthe top of the body to form an air inlet extended entirely across thedevice from side to side, mixing tubes located directly above thenozzles, means for mounting the mixing tubes in the table forlongitudinal adjustment, toward and away from the nozzles, the mixingtubes having bores that flare as they extend upwardly, and conical capsseated in the upper ends of the mixing tubes, the caps having centrallongitudinal passages, and being provided on their outer surfaces withlongitudinal grooves disposed immediately adjacent to each other andincreasing in width from their lower ends to their upper ends.

2. A device of the class described comprising a casing including a bodyhaving a fuel inlet, the casing having an air inlet located above thebody, nozzles in the top of the body, mixing tubes located directlyabove the nozzles, means for mounting the mixing tubes in the top of thecasing for longitudinal adj ustment, toward and away from the nozzles,the mixing tubes having bores that flare as they extend upwardly, andconical caps seated in the upper ends of the mixing'tubes, the capshaving central longitudinal passages, and being provided on their outersurfaces with longitudinal grooves disposed immediately adjacent to eachother and increasing in width from their lower'ends to their upper ends.

3. In a device of the class described, a mixing tube having a bore whichflares as it extends upwardly, a conical cap'se'ajted in the upper endof the mixing tube, the cap having a central longitudinal passage, andbeing provided on its outer'surfac'e with longitudinal grooves disposedimmediately adj acent to each other and increasing'in width from theirlower ends to their upper ends, and means for supplying a fuel mixtureto the tube. j

In testimony that I claim the foregoing as my own, I have heretoa'flixed my signature.

